Editors. "Charles V signs a truce with Suleiman I". The Literary Encyclopedia. First published 01 November 2010
[http://www.litencyc.com/php/stopics.php?rec=true&UID=14724, accessed 24 May 2013.]
Charles V and Ferdinand sign the Truce of Adrianople with Suleiman I, Sultan of Turkey. As the threat from the East is temporarily assuaged by this agreement, this leaves the Emperor free to address German affairs.